File:Florence and Cripple Creek Railroad Tunnel 1 - USDOT.jpg
![File:Florence and Cripple Creek Railroad Tunnel 1 - USDOT.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Florence_and_Cripple_Creek_Railroad_Tunnel_1_-_USDOT.jpg/544px-Florence_and_Cripple_Creek_Railroad_Tunnel_1_-_USDOT.jpg?20140116000447)
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